feat: curate HF model picker with OpenRouter analogues (#3440)

Show only agentic models that map to OpenRouter defaults:

  Qwen/Qwen3.5-397B-A17B          ↔ qwen/qwen3.5-plus
  Qwen/Qwen3.5-35B-A3B            ↔ qwen/qwen3.5-35b-a3b
  deepseek-ai/DeepSeek-V3.2       ↔ deepseek/deepseek-chat
  moonshotai/Kimi-K2.5             ↔ moonshotai/kimi-k2.5
  MiniMaxAI/MiniMax-M2.5           ↔ minimax/minimax-m2.5
  zai-org/GLM-5                    ↔ z-ai/glm-5
  XiaomiMiMo/MiMo-V2-Flash         ↔ xiaomi/mimo-v2-pro
  moonshotai/Kimi-K2-Thinking      ↔ moonshotai/kimi-k2-thinking

Users can still pick any HF model via Enter custom model name.

tests/test_api_key_providers.py

@@ -744,13 +744,13 @@ class TestHuggingFaceModels:
         from hermes_cli.main import _PROVIDER_MODELS
         assert "huggingface" in _PROVIDER_MODELS
         models = _PROVIDER_MODELS["huggingface"]
-        assert len(models) >= 10, "Expected at least 10 curated HF models"
+        assert len(models) >= 6, "Expected at least 6 curated HF models"
 
     def test_models_py_has_huggingface(self):
         from hermes_cli.models import _PROVIDER_MODELS
         assert "huggingface" in _PROVIDER_MODELS
         models = _PROVIDER_MODELS["huggingface"]
-        assert len(models) >= 10
+        assert len(models) >= 6
 
     def test_model_lists_match(self):
         """Model lists in main.py and models.py should be identical."""